9PQC | pdb_00009pqc

Room temperature crystal structure of enhanced Green Fluorescent Protein

• PDB DOI: https://doi.org/10.2210/pdb9PQC/pdb

• Classification: FLUORESCENT PROTEIN
• Organism(s): Aequorea victoria
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2025-07-22 Released: 2026-07-29 
• Deposition Author(s): White, K.I., Greisman, J.B., Hekstra, D.R.
• Funding Organization(s): Helen Hay Whitney Foundation, Howard Hughes Medical Institute (HHMI), Department of Energy (DOE, United States), National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 
  0.156 (Depositor), 0.156 (DCC) 
• R-Value Work: 
  0.119 (Depositor), 0.119 (DCC) 
• R-Value Observed: 
  0.121 (Depositor) 

Starting Model: experimental

Literature

Time-resolved Stark effect spectroscopy in protein crystals

White, K.I., Hunt-Isaak, I., Dalton, K.M., Greisman, J.B., Socolich, M.A., Lee, B., Klureza, M.A., Sheehan, C.J., Peck, A., Poitevin, F., Stefanescu, D., Lane, T.J., Chollet, M., Zhu, D., Hoffmann, M.C., Hekstra, D.R.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 26.97 kDa 
• Atom Count: 2,372 
• Modeled Residue Count: 229 
• Deposited Residue Count: 236 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Green fluorescent protein	A	236	Aequorea victoria	Mutation(s): 1  Gene Names: GFP
UniProt
Find proteins for P42212 (Aequorea victoria) Explore P42212  Go to UniProtKB:  P42212

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PEG	C [auth A]	DI(HYDROXYETHYL)ETHER C4 H10 O3 MTHSVFCYNBDYFN-UHFFFAOYSA-N
CA	B [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
CRO	A	L-PEPTIDE LINKING	C15 H17 N3 O5		THR, TYR, GLY

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free:  0.156 (Depositor), 0.156 (DCC) 
• R-Value Work:  0.119 (Depositor), 0.119 (DCC) 
• R-Value Observed: 0.121 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 51.533	α = 90
b = 62.83	β = 90
c = 70.636	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
DIALS	data reduction
Aimless	data scaling
PHENIX	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-07-29 
Deposition Author(s): White, K.I., Greisman, J.B., Hekstra, D.R.

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Funding Organization	Location	Grant Number
Helen Hay Whitney Foundation	United States	--
Howard Hughes Medical Institute (HHMI)	United States	--
Department of Energy (DOE, United States)	United States	DE-AC02-76SF00515
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	P41GM103393

Revision History  

• Version 1.0: 2026-07-29
  Type: Initial release